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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 14 — Jul. 6, 2009
  • pp: 11978–11985

Reversing the weak quantum measurement for a photonic qubit

Yong-Su Kim, Young-Wook Cho, Young-Sik Ra, and Yoon-Ho Kim  »View Author Affiliations

Optics Express, Vol. 17, Issue 14, pp. 11978-11985 (2009)

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We demonstrate the conditional reversal of a weak (partial-collapse) quantum measurement on a photonic qubit. The weak quantum measurement causes a nonunitary transformation of a qubit which is subsequently reversed to the original state after a successful reversing operation. Both the weak measurement and the reversal operation are implemented linear optically. The state recovery fidelity, determined by quantum process tomography, is shown to be over 94% for partial-collapse strength up to 0.9. We also experimentally study information gain due to the weak measurement and discuss the role of the reversing operation as an information erasure.

© 2009 Optical Society of America

OCIS Codes
(270.5570) Quantum optics : Quantum detectors
(270.5565) Quantum optics : Quantum communications
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: May 20, 2009
Revised Manuscript: June 17, 2009
Manuscript Accepted: June 21, 2009
Published: June 30, 2009

Yong-Su Kim, Young-Wook Cho, Young-Sik Ra, and Yoon-Ho Kim, "Reversing the weak quantum measurement for a photonic qubit," Opt. Express 17, 11978-11985 (2009)

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